The disclosure relates to apparatuses for producing a glass ribbon, the apparatuses comprising a forming body (100) comprising an upper trough-shaped portion comprising two trough walls and a trough bottom; a lower wedge-shaped portion; a delivery end configured to receive molten glass; and a compression end (237) comprising a curb (243); and an end cap (205) coupled to the compression end (237) and extending over a top surface of the curb (243), wherein a height of the curb (243) is greater than a height of the two trough walls at a point proximate the compression end (237). Also disclosed herein are methods for producing a glass ribbon using such apparatuses. This minimizes glass flow into the end cap and over the compression end of the forming body and minimizes formations of gobs.
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18. An apparatus for producing a glass ribbon, comprising:
a forming body comprising:
an upper trough-shaped portion comprising two trough walls and a trough bottom;
a lower wedge-shaped portion;
a delivery end configured to receive molten glass;
a compression end comprising a curb; and
a diverter positioned on the trough bottom between the two trough walls, the diverter forming an angle relative to the trough bottom within a range from about 2° to about 4°; and
an end cap coupled to the compression end and extending over the curb,
wherein a height of the curb is greater than a height of the two trough walls at the compression end.
13. A method for producing a glass ribbon, comprising:
melting batch materials to form molten glass; and
introducing the molten glass into an apparatus comprising:
a forming body comprising:
an upper trough-shaped portion comprising two trough walls and a trough bottom, the upper trough-shaped portion defining a trough that is bounded by the two trough walls and the trough bottom, the trough configured to receive the molten glass between the two trough walls and on the trough bottom;
a lower wedge-shaped portion comprising two opposing outer surfaces converging at a root;
a delivery end configured to receive the molten glass; and
a compression end comprising a curb; and
an end cap coupled to the compression end and extending over the curb, wherein a height of the curb is greater than a height of the two trough walls at the compression end; and
directing the molten glass out of the upper trough-shaped portion and over the two trough walls with a diverter positioned within the trough in contact with the trough bottom and between the two trough walls;
wherein the diverter is attached to an auxiliary plate attached to the end cap.
12. A fusion draw machine comprising a forming body comprising: an upper trough-shaped portion comprising two trough walls and a trough bottom, the upper trough-shaped portion defining a trough that is bounded by the two trough walls and the trough bottom, the trough configured to receive molten glass between the two trough walls and on the trough bottom; a lower wedge-shaped portion; a delivery end configured to receive the molten glass; a compression end comprising a curb; and a diverter positioned within the trough in contact with the trough bottom and between the two trough walls, the diverter comprising a width spanning a distance between the two trough walls of the upper trough-shaped portion; and an end cap coupled to the compression end and extending over the curb, wherein a height of the curb is greater than a height of the two trough walls at the compression end, the diverter attached to the end cap; wherein the diverter is attached to an auxiliary plate attached to the end cap, further wherein upper surfaces of the two trough walls extend along a plane, a first portion of the diverter located on a first side of the plane and a second portion of the diverter located on an opposing second side of the plane.
1. An apparatus for producing a glass ribbon, comprising:
a forming body comprising:
an upper trough-shaped portion comprising two trough walls and a trough bottom, the upper trough-shaped portion defining a trough that is bounded by the two trough walls and the trough bottom, the trough configured to receive molten glass between the two trough walls and on the trough bottom;
a lower wedge-shaped portion;
a delivery end configured to receive the molten glass;
a compression end comprising a curb; and
a diverter positioned within the trough in contact with the trough bottom and between the two trough walls, the diverter comprising a width spanning a distance between the two trough walls of the upper trough-shaped portion; and
an end cap coupled to the compression end and extending over the curb,
wherein a height of the curb is greater than a height of the two trough walls at the compression end, the diverter attached to the end cap;
wherein the diverter is attached to an auxiliary plate attached to the end cap, further wherein upper surfaces of the two trough walls extend along a plane, a first portion of the diverter located on a first side of the plane and a second portion of the diverter located on an opposing second side of the plane.
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This application claims the benefit of priority under 35 U.S.C. § 365 of International Patent Application Serial No. PCT/US15/53075 filed on Sep. 30, 2015 designating the United States of America, which claims the benefit of priority to U.S. Provisional Application No. 62/057,416 filed Sep. 30, 2014 the content of which are incorporated herein by reference in their entirety.
The present disclosure relates generally to forming bodies for glass manufacturing systems, and more particularly to isopipes for use in fusion draw machines.
High-performance display devices, such as liquid crystal displays (LCDs) and plasma displays, are commonly used in various electronics, such as cell phones, laptops, electronic tablets, televisions, and computer monitors. Currently marketed display devices can employ one or more high-precision glass sheets, for example, as substrates for electronic circuit components, or as color filters, to name a few applications. The leading technology for making such high-quality glass substrates is the fusion draw process, developed by Corning Incorporated, and described, e.g., in U.S. Pat. Nos. 3,338,696 and 3,682,609, which are incorporated herein by reference in their entireties.
The fusion draw process can utilize a fusion draw machine (FDM) comprising a forming body (e.g., isopipe). The forming body can comprise an upper trough-shaped portion and a lower portion having a wedge-shaped cross-section with two major side surfaces (or forming surfaces) sloping downwardly to join at a root. During operation, the trough is filled with molten glass, e.g., glass having a viscosity ranging from about 16,000 to about 75,000 poise, which is allowed to flow over the trough side walls (or weirs) and down along the two forming surfaces as two glass ribbons, which ultimately converge at the root where they fuse together to form a unitary glass ribbon. The glass ribbon can thus have two pristine external surfaces that have not been exposed to the surface of the forming body. The ribbon can then be drawn down and cooled to form a glass sheet having a desired thickness and a pristine surface quality.
During the glass forming process, molten glass can be delivered to one end of the isopipe (“delivery end”) and can travel down the length of the isopipe while flowing over the weirs to an opposite end (“compression end”). Forming bodies such as isopipes are often constructed of refractory ceramic materials, such as zircon, zirconia, alumina, and the like, which can have a coefficient of thermal expansion (CTE) that can widely vary as compared to the CTE of metal components of the isopipe, such as the end cap and/or plow. For instance, platinum and platinum-containing alloys can expand about two times as much as zircon at elevated temperatures. The expansion differential between the two materials can cause gaps to form during operation.
At operating temperatures, gaps can form that are large enough for glass at lower viscosities to flow through, particularly during flushing procedures. The molten glass can then begin to collect in an end cap of the isopipe. Glass collected in the end cap can be inactive and relatively stable, but can eventually leak out if the end cap malfunctions. For instance, leaks in the end cap can be caused by contamination of the welds and/or deterioration of the metal, e.g., due to contact with certain materials such as SiC. In some instances, excess glass volume in the end cap can cause the metal to bulge and place stress on the weld lines and/or stretch already thinned areas of the end cap. Bulging of the end cap can also cause it to contact a structure enclosing the forming body, thereby forming holes in the end cap. Excessive glass volume in the end cap can also force it to slip off the forming body, or isopipe, entirely.
Glass leaking from the end cap on the compression end can flow down into the rest of the process, e.g., behind an edge director at the edges of the primary glass flow, and is referred to in the art as “gobs.” Gobs can collect in size around the edge rolls below the root of the isopipe and can interfere with the pulling action. The gobs can also break off and cause glass pieces to get pinched between the glass and the lower rolls, which can result in significant glass breakage. Moreover, depending on the rate of glass flow into the end cap and the subsequent flow rate out of a leak in the end cap, early repair of the forming body or surrounding equipment may be required.
The amount of glass that collects in the end cap can be dependent on various factors, such as the amount of time the glass is in a low viscosity state, e.g., less than about 35,000 poise, the tightness of fit of the end cap, the depth of the isopipe trough, the angle of the weirs (as machined or as a function of process down tilts), and/or the process temperature (which can affect the expansion difference between the materials). For example, an end cap may not be attached or sealed to the isopipe other than by a tight mechanical fit. A slot can thus exist between the end cap and the isopipe as large as about 0.04 cm (0.015″). Molten glass having a viscosity of less than about 35,000 poise can flow through a 0.04 cm slot. Moreover, due to the gradual decline of the weirs from the delivery end to the compression end at a constant angle, e.g., a 6 degree angle, the top surface of the isopipe at the end cap region can be below the head level of the glass at the compression end. This can provide additional pressure for the glass to flow through the gaps or slots. Once the glass flows through the gaps or slots, it can flow into the end cap and over the end of the isopipe, resulting in one or more of the disadvantages discussed above.
Previous attempts to limit equipment damage, production loss, and/or glass damage due to gobs have included implementation of gob collection devices within the manufacturing system. However, gob collecting can upset operating parameters, such as thermal and/or mass balance, particularly in the case of glass forming processes for thin (e.g., less than about 0.3 mm) glass sheets. Frequency of flushing can, for instance, be increased to compensate for glass conversions and/or liquidus devit issues in high-precision glasses. Processes using longer and/or more frequent flushing can suffer from increased frequency and/or amount of glass leakage. Thus, thermal impact due to the collection and removal of large end mass using conventional methods can be detrimental to the glass forming process.
Consumer demand for high-performance displays with ever growing size and image quality requirements drives the need for improved manufacturing processes for producing high-quality, high-precision glass sheets. Accordingly, it would be advantageous to provide methods and apparatuses for forming glass ribbons and sheets which can minimize glass defects and/or breakage, as well as reducing equipment damage and process instabilities. In various embodiments, the methods and apparatuses disclosed herein can minimize glass flow into the end cap and over the compression end of the forming body, as well as the formation of gobs, which can minimize or prevent production losses and equipment damage.
The disclosure relates to apparatuses for producing a glass ribbon, the apparatuses comprising a forming body comprising an upper trough-shaped portion comprising two trough walls and a trough bottom; a lower wedge-shaped portion; a delivery end configured to receive molten glass; and a compression end comprising a curb; and an end cap coupled to the compression end and extending over a top surface of the curb, wherein a height of the curb is greater than a height of the two trough walls at a point proximate the compression end. Fusion draw machines comprising such forming body apparatuses are also disclosed herein.
Further disclosed herein are methods for producing a glass ribbon, the methods comprising melting batch materials to form molten glass and introducing the molten glass into an apparatus comprising a forming body comprising an upper trough-shaped portion comprising two trough walls and a trough bottom; a lower wedge-shaped portion comprising two opposing outer surfaces converging at a root; a delivery end configured to receive the molten glass; and a compression end comprising a curb; and an end cap coupled to the compression end and extending over a top surface of the curb, wherein a height of the curb is greater than a height of the two trough walls at a point proximate the compression end.
In various embodiments, the forming body can comprise a refractory material chosen from zircon, zirconia, alumina, magnesium oxide, silicon carbide, silicon nitride, silicon oxynitride, and combinations thereof. According to some embodiments, the forming body apparatus can further comprise a diverter positioned proximate the curb and attached to the end cap. In certain embodiments, the end cap and/or diverter can comprise a precious metal, such as platinum or platinum-containing alloys, and the end cap and diverter can be welded together. According to further embodiments, the forming body apparatus can comprise an auxiliary filler piece positioned between the curb and the diverter and/or a yoke positioned on top of a surface of the end cap. The curb can, in various non-limiting embodiments, have a height greater than a height of the molten glass at the compression end.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, and in part will be readily apparent to those skilled in the art from that description or recognized by practicing the methods as described herein, including the detailed description which follows, the claims, as well as the appended drawings.
It is to be understood that both the foregoing general description and the following detailed description present various embodiments of the disclosure, and are intended to provide an overview or framework for understanding the nature and character of the claims. The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated into and constitute a part of this specification. The drawings illustrate various embodiments of the disclosure and together with the description serve to explain the principles and operations of the disclosure.
The following detailed description can be best understood when read in conjunction with the following drawings, where like structures are indicated with like reference numerals where possible and in which:
Disclosed herein are apparatuses for producing a glass ribbon, the apparatuses comprising a forming body comprising an upper trough-shaped portion comprising two trough walls and a trough bottom; a lower wedge-shaped portion; a delivery end configured to receive molten glass; and a compression end comprising a curb; and an end cap coupled to the compression end and extending over a top surface of the curb, wherein a height of the curb is greater than a height of the two trough walls at a point proximate the compression end. Fusion draw machines comprising such forming body apparatuses are also disclosed herein.
Embodiments of the disclosure will be discussed with reference to
The forming body 100 can comprise any material suitable for use in a glass manufacturing process, for example, refractory materials such as zircon, zirconia, alumina, magnesium oxide, silicon carbide, silicon nitride, silicon oxynitride, and combinations thereof. According to various embodiments, the forming body may comprise a unitary piece, e.g., one piece machined from a single source. In other embodiments, the forming body may comprise two or more pieces bonded, fused, attached, or otherwise coupled together, for instance, the trough-shaped portion and wedge-shaped portion may be two separate pieces comprising the same or different materials. The dimensions of the forming body, including the length, trough depth and width, and wedge height and width, to name a few, can vary depending on the desired application. It is within the ability of one skilled in the art to select these dimensions as appropriate for a particular manufacturing process or system.
As illustrated in
The trough bottom 123 can, in certain embodiments, gradually incline at an angle Θ1, from the delivery end (not shown) to the compression end 139, with respect to a horizontal axis X of the forming body. This angle can, for instance, range from about 1° to about 3°, such as from about 1.25° to about 2.5°, from about 1.5° to about 2.25°, or from about 1.75° to about 2°, including all ranges and subranges therebetween. As such, in some embodiments, the depth of the trough at the delivery end can be greater than the depth of the trough at the compression end. The depth of the trough can also vary along the length of the isopipe in a linear or non-linear fashion.
The diverter can provide an additional contour on the trough bottom with an incline at an angle Θ2 ranging, e.g., from about 2° to about 4°, such as from about 2.5° to about 3.75°, from about 2.75° to about 3.5°, or from about 3° to about 3.25°, including all ranges and subranges therebetween. The trough wall(s) 125a (125b not shown) can similarly gradually decline at an angle Θ3 (e.g., weir angle), from the delivery end (not shown) to the compression end 137, with respect to a horizontal axis X of the forming body. This angle can, for instance, range from about 4° to about 8°, such as from about 4.5° to about 7°, from about 5° to about 6.5°, or from about 5.5° to about 6°, including all ranges and subranges therebetween. According to certain embodiments, the trough sides decline at about a 6° angle with respect to the axis X.
The end cap 105 can be coupled to the compression end 137 (as discussed in more detail below with respect to
Region z can, in certain embodiments, begin at the intersection of the weir angle Θ3 and the trough bottom angle Θ1. Moreover, region z can also continue to gradually decline at an angle similar to or the same as the weir angle Θ3, e.g., the trough bottom and the trough sides can have substantially the same height, forming a substantially flat surface (which can be at an angle Θ3) to which the end cap 105 can be coupled. The end cap 105 can thus comprise a first portion 105a in contact with a surface of region z, and a second portion 105b, extending vertically, to which the diverter 131 can be welded or otherwise attached. While the second portion 105b is depicted at a 90° angle with respect to the horizontal axis X, it is to be understood that this portion can extend vertically at any angle with respect to the axis X or with respect to the trough bottom angle Θ1.
As previously discussed, while the end cap can be coupled to the compression end and may thus be in physical contact with the forming body, it may not be sealed or otherwise attached to the forming body. As such, a gap may exist between the end cap and the forming body that can be as large as about 0.04 cm, such as about 0.038 cm, 0.035 cm, 0.03 cm, 0.025 cm, 0.02 cm, 0.015 cm, or 0.01 cm, including all ranges and subranges therebetween. Moreover, the expansion of the end cap material, e.g., platinum, with increasing temperatures can be greater than the expansion of the forming body material, e.g., zircon, which can, in various embodiments, cause any gaps between the end cap and the forming body to increase in size.
Due to the height of the yoke 141, the glass may not spill over the top of the compression end of the forming body in this forming body design. However, this design still relies on the mechanical strength of the end cap to catch and retain any leaking glass and may not address the flow of glass into the end cap itself. As discussed above, if the mechanical strength of the end cap is compromised, e.g., a leak or hole is formed, the subsequent flow of glass through the end cap and down into the primary glass flow (“gobs”) can present numerous disadvantages.
The surfaces of the curb 243 are depicted and labeled in
Furthermore, an interior surface 243c of the curb can be non-planar as depicted in
Referring back to
The end cap 205 can be coupled to the compression end, including the curb 243, for instance, a first portion 205a can extend around or across various curb surfaces, such as the exterior, top, and/or side surfaces (not labeled) of the curb, and a second portion 205b can extend radially from various surfaces of the forming body, e.g., vertically from the top surface of the curb and horizontally from the trough side surfaces. The diverter or plow 231 may be attached at least in part to the end cap 205. For instance, the diverter 231 can be welded to the second portion 205b of the end cap. Attachment (or welding) of the diverter to the end cap can be achieved using a variety of configurations and methods. Notably, as depicted in
Disclosed herein are methods for producing a glass ribbon, the methods comprising melting batch materials to form molten glass and introducing the molten glass into an apparatus comprising a forming body comprising an upper trough-shaped portion comprising two trough walls and a trough bottom; a lower wedge-shaped portion comprising two opposing outer surfaces converging at a root; a delivery end configured to receive the molten glass; and a compression end comprising a curb; and an end cap coupled to the compression end and extending over a top surface of the curb, wherein a height of the curb is greater than a height of the two trough walls at a point proximate the compression end.
Embodiments of the disclosure will be discussed with reference to
Glass batch materials can be introduced into the melting vessel 310, as shown by arrow 312, to form molten glass 314. The fining vessel 320 is connected to the melting vessel 310 by the melting to fining tube 315. The fining vessel 320 can have a high temperature processing area that receives the molten glass from the melting vessel 310 and which can remove bubbles from the molten glass. The fining vessel 320 is connected to the stir chamber 330 by the fining to stir chamber connecting tube 325. The stir chamber 330 is connected to the bowl 340 by the stir chamber to bowl connecting tube 335. The bowl 340 can deliver the molten glass through the downcomer 345 into the FDM 350.
The FDM 350 can include an inlet 355, a forming body 360, and a pull roll assembly 365. The inlet 355 can receive the molten glass from the downcomer 345, from which it can flow to the forming body apparatus 360, where it is formed into a glass ribbon 304. Various embodiments of the forming body apparatus 360 are further described above, e.g., with reference to
The term “batch materials” and variations thereof are used herein to denote a mixture of glass precursor components which, upon melting, react and/or combine to form a glass. The glass batch materials may be prepared and/or mixed by any known method for combining glass precursor materials. For example, in certain non-limiting embodiments, the glass batch materials can comprise a dry or substantially dry mixture of glass precursor particles, e.g., without any solvent or liquid. In other embodiments, the glass batch materials may be in the form of a slurry, for example, a mixture of glass precursor particles in the presence of a liquid or solvent.
According to various embodiments, the batch materials may comprise glass precursor materials, such as silica, alumina, and various additional oxides, such as boron, magnesium, calcium, sodium, strontium, tin, or titanium oxides. For instance, the glass batch materials may be a mixture of silica and/or alumina with one or more additional oxides. In various embodiments, the glass batch materials comprise from about 45 to about 95 wt % collectively of alumina and/or silica and from about 5 to about 55 wt % collectively of at least one oxide of boron, magnesium, calcium, sodium, strontium, tin, and/or titanium.
The batch materials can be melted according to any method known in the art, including the methods discussed herein with reference to
The molten glass can subsequently undergo various additional processing steps, including fining to remove bubbles, and stirring to homogenize the glass melt, to name a few. The molten glass can then be processed to produce a glass ribbon using the forming body apparatuses disclosed herein. For example, as discussed above, the molten glass can be introduced into the trough-shaped portion of the forming body at the delivery end via one or more inlets. The glass can flow in a direction proceeding from the delivery end to the compression end, over the two trough walls, and down the two opposing outer surfaces of the wedge-shaped portion, converging at the root to form a unitary glass ribbon.
By way of a non-limiting example, the forming body apparatus may be enclosed in a vessel operating at a temperature ranging, at its hottest point (e.g., in an upper “muffle” region proximate the trough-shaped portion), from about 1100° C. to about 1350° C., such as from about 1150° C. to about 1325° C., from about 1150° C. to about 1300° C., from about 1175° C. to about 1250° C., or from about 1200° C. to about 1225° C., including all ranges and subranges therebetween. At its coolest point (e.g., in a lower “transition” region proximate the root of the forming body), the vessel may operate at a temperature ranging from about 800° C. to about 1250° C., such as from about 850° C. to about 1225° C., from about 900° C. to about 1200° C., from about 950° C. to about 1150° C., or from about 1000° to about 1100° C., including all ranges and subranges therebetween.
The methods and apparatuses disclosed herein may provide one or more advantages over prior art forming body assemblies. In certain embodiments, the apparatuses disclosed herein can reduce or eliminate gobs caused by glass leaking into and out of the end cap on the compression end. Gob reduction can improve yield by reducing the amount of rubicons from glass gobs falling into the process stream. Additionally, when glass gobs grow large, they can change the local thermodynamics of the system such that there is a difference in temperature when the gobs are present and when they are not present. Eliminating or reducing gob formation can therefore improve the thermodynamic stability of a glass manufacturing system employing the disclosed apparatuses. Moreover, by reducing glass flow over the compression end, the disclosed apparatuses can improve or increase glass flow over the trough sides proximate the compression end, thus possibly improving glass ribbon uniformity and/or reducing material waste. Finally, because the instant methods and apparatuses can reduce or eliminate glass flow into the end cap and thus any subsequent damage to the end cap due to excessive glass volume, damage to the forming body apparatus and the surrounding equipment can be minimized as well as process down time for repairs, thereby improving manufacturing speed and efficiency. Of course, it is to be understood that the methods and apparatuses disclosed herein may not have one or more of the above advantages, but such methods and apparatuses are intended to fall within the scope of the appended claims.
It will be appreciated that the various disclosed embodiments may involve particular features, elements or steps that are described in connection with that particular embodiment. It will also be appreciated that a particular feature, element or step, although described in relation to one particular embodiment, may be interchanged or combined with alternate embodiments in various non-illustrated combinations or permutations.
It is also to be understood that, as used herein the terms “the,” “a,” or “an,” mean “at least one,” and should not be limited to “only one” unless explicitly indicated to the contrary. Thus, for example, reference to “a component” includes examples having two or more such components unless the context clearly indicates otherwise.
Ranges can be expressed herein as from “about” one particular value, and/or to “about” another particular value. When such a range is expressed, examples include from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent “about,” it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint.
The terms “substantial,” “substantially,” and variations thereof as used herein are intended to note that a described feature is equal or approximately equal to a value or description. Moreover, “substantially similar” is intended to denote that two values are equal or approximately equal. In some embodiments, “substantially similar” may denote values within about 10% of each other, such as within about 5% of each other, or within about 2% of each other.
Unless otherwise expressly stated, it is in no way intended that any method set forth herein be construed as requiring that its steps be performed in a specific order. Accordingly, where a method claim does not actually recite an order to be followed by its steps or it is not otherwise specifically stated in the claims or descriptions that the steps are to be limited to a specific order, it is no way intended that any particular order be inferred.
While various features, elements or steps of particular embodiments may be disclosed using the transitional phrase “comprising,” it is to be understood that alternative embodiments, including those that may be described using the transitional phrases “consisting” or “consisting essentially of,” are implied. Thus, for example, implied alternative embodiments to an apparatus that comprises A+B+C include embodiments where an apparatus consists of A+B+C and embodiments where an apparatus consists essentially of A+B+C.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present disclosure without departing from the spirit and scope of the disclosure. Since modifications combinations, sub-combinations and variations of the disclosed embodiments incorporating the spirit and substance of the disclosure may occur to persons skilled in the art, the disclosure should be construed to include everything within the scope of the appended claims and their equivalents.
Markham, Shawn Rachelle, Feenaughty, John Michael
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